Difference between revisions of "Astragals (2)"

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'''2-4-015
'''2-4-015


1. Bars used to support the glazing and the roof of a lantern.
1. Bars used to support the glazing and the roof of a lantern.


[[Image:Ch2_Fig33.jpg|400px]]
[[Image:Ch2_Fig33.jpg|400px|border]]




2. In the U.S.A., loosely used for bars supporting the optical elements of a prismatic lens or of a fixed lens. (Fig. 16b)
2. In the U.S.A., loosely used for bars supporting the optical elements of a prismatic lens or of a fixed lens. (Fig. 16b)
[[Image:Ch2_Fig16b.jpg|400px|border]]




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[[Category:Alphabetical Index]]
[[Category:Alphabetical Index]]
[[Category:IALA Dictionary 1970-89 Edition]]
[[Category:IALA Dictionary 1970-89 Edition]]
[[Category:IALA Dictionary 2023 Revision]]

Latest revision as of 23:16, 1 February 2024

2-4-015

1. Bars used to support the glazing and the roof of a lantern.

Ch2 Fig33.jpg


2. In the U.S.A., loosely used for bars supporting the optical elements of a prismatic lens or of a fixed lens. (Fig. 16b)

Ch2 Fig16b.jpg


Note 1: In Britain, the term is used in sense 2 only in respect of a fixed lens.


Note 2: The German term Verstrebungen is also used for bars supporting the optical elements of a prismatic lens or of a fixed lens.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)